• Provide a parenthesized list of comma-separated column names following the table name. In this case, a value for each named column must be provided by the VALUES list or the statement. • If you do not specify a list of column names for or, values for every column in the table must be provided by the VALUES list or the statement. If you do not know the order of the columns in the table, use DESCRIBE tbl_name to find out.

• A SET clause indicates columns explicitly by name, together with the value to assign each one. Column values can be given in several ways. • If strict SQL mode is not enabled, any column not explicitly given a value is set to its default (explicit or implicit) value.

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For example, if you specify a column list that does not name all the columns in the table, unnamed columns are set to their default values. Default value assignment is described in.

If strict SQL mode is enabled, an statement generates an error if it does not specify an explicit value for every column that has no default value. • If both the column list and the VALUES list are empty, creates a row with each column set to its default value: INSERT INTO tbl_name () VALUES(); If strict mode is not enabled, MySQL uses the implicit default value for any column that has no explicitly defined default. If strict mode is enabled, an error occurs if any column has no default value. • Use the keyword DEFAULT to set a column explicitly to its default value. This makes it easier to write statements that assign values to all but a few columns, because it enables you to avoid writing an incomplete VALUES list that does not include a value for each column in the table.

Otherwise, you must provide the list of column names corresponding to each value in the VALUES list. • If a generated column is inserted into explicitly, the only permitted value is DEFAULT. For information about generated columns, see. • In expressions, you can use to produce the default value for column col_name. • Type conversion of an expression expr that provides a column value might occur if the expression data type does not match the column data type.

Conversion of a given value can result in different inserted values depending on the column type. For example, inserting the string '1999.0e-2' into an,,, or column inserts the value 1999, 19.9921, 19.992100, or 1999, respectively. The value stored in the and columns is 1999 because the string-to-number conversion looks only at as much of the initial part of the string as may be considered a valid integer or year.

For the and columns, the string-to-number conversion considers the entire string a valid numeric value. • An expression expr can refer to any column that was set earlier in a value list. For example, you can do this because the value for col2 refers to col1, which has previously been assigned: INSERT INTO tbl_name (col1,col2) VALUES(15,col1*2); But the following is not legal, because the value for col1 refers to col2, which is assigned after col1: INSERT INTO tbl_name (col1,col2) VALUES(col2*2,15); An exception occurs for columns that contain AUTO_INCREMENT values. Because AUTO_INCREMENT values are generated after other value assignments, any reference to an AUTO_INCREMENT column in the assignment returns a 0. Statements that use VALUES syntax can insert multiple rows. To do this, include multiple lists of comma-separated column values, with lists enclosed within parentheses and separated by commas.

Example: INSERT INTO tbl_name (a,b,c) VALUES(1,2,3),(4,5,6),(7,8,9); Each values list must contain exactly as many values as are to be inserted per row. The following statement is invalid because it contains one list of nine values, rather than three lists of three values each: INSERT INTO tbl_name (a,b,c) VALUES(1,2,3,4,5,6,7,8,9); VALUE is a synonym for VALUES in this context. Neither implies anything about the number of values lists, nor about the number of values per list. Either may be used whether there is a single values list or multiple lists, and regardless of the number of values per list. The affected-rows value for an can be obtained using the SQL function or the C API function. If you use an statement with multiple value lists or, the statement returns an information string in this format: Records: N1 Duplicates: N2 Warnings: N3 If you are using the C API, the information string can be obtained by invoking the function. Records indicates the number of rows processed by the statement.